Automatic draft-controller.



n Patehted Feb. l8, I902.

cur. PEEI FFER. AUTOMATIC DRAFT CONTROLLER.

(Applicntioufiled Jan. 10, 1901.

(No Model.)

THE NORRIS PETERS 50v. vNoTo-uTfla, WhSHINOTON n c,

UNITED STATES PATENT OFFICE.

CHARLES T. PFEIFFER, OF MILWAUKEE, WISCONSIN.

AUTOMATIC DRAFT-CONTROLLER.

SPECIFICATION forming part of Letters Patent No. 693,437, dated February is, 1902.

Application filed January 10, 1901- Serial No. 42,721. (No model.)

To all whom it may concern.-

Be itknown that I, OHAELEs T. PFEIFFER, a citizen of the United States, and a resident of Milwaukee, in the county of Milwaukee and State of Wisconsin, have invented certain new and useful Improvements in Automatic Draft-Controllers; and I do hereby declare that the following is a full, clear, and exact description thereof.

.My invention has for its object to provide for automatic control of the outlet area of nozzles through which exhaust-steam has passage to create draft in a boiler-furnace, it being'desirable-to partially close such anozzle,

and thereby increase the draft when there is diminution of the boiler-pressure of steam from a predetermined degree, said invention being particularly applicable in conjunction with locomotive exhaust-nozzles and consisting in certain peculiarities of construction and combination of parts hereinafter set forth With reference to the accompanying drawings and subsequently claimed.

Figure 1 of the drawings represents a front elevation of a portion of a locomotive partly vin section and provided with means in accordance with my invention by which to partially close its exhaust-nozzle when there is a diminution of the boiler-pressure of steam from a predetermined degree; audFig. 2, a detail elevation of a cylinder and steam-pipe in connection therewith, these parts being embodied in the means aforesaid for accomplishing the object of said invention.

Referring by letter to the drawings, A indicates the ordinary conical exhaust-nozzle of a locomotive, with the exception that it is herein shown provided with upper diametrically opposite ears I), to which are bolted cor,- responding lower ears 0 of a conical shell B, that constitutes a detachable extension of said nozzle, this shell being interiorly grooved to provide guideways for a horizontal gate 0, that is also guided in a slotted outer boss (1 of said shell. A rod D in union with the gate 0 extends through a stuffing-box in a head of a cylinder E, herein shown made fast to the smokebox shell F of the locomotive. Within the cylinder is a piston G in unionv with the rod D, and a spiral spring H of suitable power is arranged in said cylinder to be compressed by forward thrust of the piston.

A pipe I is herein shown as having one end thereof in connection with the steam-dome J of the locomotive, its other end being in union with a port-nipple e of cylinder E; but the former end of the pipe may be fitted to the locomotive-boiler, and in either case steam is admittedto said cylinder back of piston G at boiler-pressure. In order to drain Water ofcondensation from the cylinder E,

the same is provided with a waste-cock f of 7 common knowledge.

' When there is steam-pressure of a predetermined degree back of piston G, the latter will be moved outward to compress spring H and at the same time retract the gate 0, the

Now

tical to utilize a one-piece nozzle provided with a gate similar to the one 0 herein set forth in connection with the rod of a piston arranged in a cylinder to be moved in one direction by steam-pressure and in the opposite direction by expansive force of a spring.

Having thus described my invention, what I I claim asne'w, and desire to secure by Letters Patent, is r r The combination of a steam exhaust-nozzle, a horizontal slide-gate arranged in "conjunction with the nozzle to govern its-outlet I 0 area, a cylinder arranged and connected to. be supplied with steam at boiler-pressure, a

piston in the cylinder ahead of its steam-inlet, a rod-connectingthe gate and piston through a stufiing-box in a cylinder-head,

and a spring between the piston and other cylinder-head compressible under a predetermined degree of steam-pressure exertedv on said piston.

In testimony that I claim the foregoing I have hereunto set my hand, at Milwaukee, in the county of Milwaukee and 'State of Wisconsin, in the presence of twowitnesses.

CHARLES T. PFEIFFER.

Witnesses:

N. E. ()LIPHANT, .H. H. MEIXSELL.

Ioo 

